Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$34.5M |
| 2 |
Micron Technology
MU
|
+$33.9M |
| 3 |
Berkshire Hathaway Class B
BRK.B
|
+$30.8M |
| 4 |
NVIDIA
NVDA
|
+$23.5M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$22.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
TWX
Time Warner Inc
TWX
|
+$34.8M |
| 2 |
Amazon
AMZN
|
+$31.2M |
| 3 |
Tesla
TSLA
|
+$17.6M |
| 4 |
Netflix
NFLX
|
+$15.5M |
| 5 |
Advanced Micro Devices
AMD
|
+$12.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 1.23% |
| 2 | Consumer Discretionary | 0.92% |
| 3 | Communication Services | 0.73% |
| 4 | Financials | 0.62% |
| 5 | Industrials | 0.6% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
526
CALL
TripAdvisor
TRIP
$1.61B
| $5.54M | 0.02% |
994
+96
| +11% | +$4.59K |
|
527
CALL
Analog Devices
ADI
$188B
| $5.5M | 0.02% |
573
+322
| +128% | +$30.4K |
|
528
PUT
Factset
FDS
$8.72B
| $5.49M | 0.02% |
277
+126
| +83% | +$25.2K |
|
529
PUT
Everest Group
EG
$14.8B
| $5.49M | 0.02% |
+238
| New | +$55.9K |
|
530
PUT
Advance Auto Parts
AAP
$3.35B
| $5.47M | 0.02% |
403
+84
| +26% | +$10.2K |
|
531
CALL
United States Natural Gas Fund
UNG
$472M
| $5.46M | 0.02% |
576
-89
| -13% | -$8.23K |
|
532
Phillips 66
PSX
$84.8B
| $5.45M | 0.02% |
+48,518
| New | +$5.45M |
|
533
CALL
Applied Materials
AMAT
$440B
| $5.45M | 0.02% |
1,179
-2,028
| -63% | -$105K |
|
534
Keurig Dr Pepper
KDP
$41.1B
| $5.45M | 0.02% |
+44,633
| New | +$5.36M |
|
535
CALL
WisdomTree US Total Dividend Fund
DTD
$1.65B
| $5.43M | 0.02% |
2,120
-2,008
| -49% | -$91K |
|
536
PUT
Ralph Lauren
RL
$23B
| $5.43M | 0.02% |
432
+192
| +80% | +$23.3K |
|
|
BNY
537
PUT
Bank of New York Mellon
BNY
$110B
| $5.42M | 0.02% |
1,006
+613
| +156% | +$33.8K |
|
538
CALL
Trip.com Group
TCOM
$26.8B
| $5.42M | 0.02% |
1,139
+760
| +201% | +$34.3K |
|
|
BWP
539
CALL
DELISTED
Boardwalk Pipeline Partners
BWP
| $5.42M | 0.02% |
4,661
+4,437
| +1,981% | +$46.9K |
|
540
State Street Industrial Select Sector SPDR ETF
XLI
$33.2B
| $5.41M | 0.02% |
75,505
+66,318
| +722% | +$4.92M |
|
541
Intuitive Surgical
ISRG
$121B
| $5.4M | 0.02% |
+33,867
| New | +$5.16M |
|
542
CALL
Under Armour Class C
UA
$3.02B
| $5.38M | 0.02% |
2,443
+1,021
| +72% | +$18.1K |
|
543
PUT
Edwards Lifesciences
EW
$48.6B
| $5.37M | 0.02% |
1,107
+846
| +324% | +$39.5K |
|
544
PUT
Snap
SNAP
$7.52B
| $5.36M | 0.02% |
4,091
-2,203
| -35% | -$28.4K |
|
545
CALL
LyondellBasell Industries
LYB
$20.1B
| $5.34M | 0.02% |
486
+336
| +224% | +$36.9K |
|
546
CALL
American Tower
AMT
$77.4B
| $5.3M | 0.02% |
368
-44,876
| -99% | -$6.24M |
|
|
HUYA
547
CALL
Huya Inc
HUYA
$547M
| $5.29M | 0.02% |
+1,609
| New | +$48.3K |
|
548
CALL
Thermo Fisher Scientific
TMO
$196B
| $5.28M | 0.02% |
255
-81
| -24% | -$17.2K |
|
549
CALL
Wayfair
W
$11.1B
| $5.25M | 0.02% |
442
+18
| +4% | +$1.56K |
|
550
PUT
Teleflex
TFX
$5.97B
| $5.23M | 0.02% |
195
+5
| +3% | +$1.34K |
|
Similar funds
Simplex Trading's Q2 2018 Portfolio in Review
As of Q2 2018, Simplex Trading held 8,400 positions worth $25.5B, up 1,022% from $2.27B the previous quarter. Its ten largest holdings account for 29% of the portfolio.
Simplex Trading's Q2 2018 filing shows 2,282 new, 2,314 increased, 2,591 reduced and 1,035 closed positions. Its largest new stake was Alphabet (Google) Class C: 291,860 shares worth $16.3M. The largest sale was Time Warner Inc, an estimated $34.8M.
By sector, the portfolio is most concentrated in Technology at 1.2% of assets, down from 6.2% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q2 2018 buy was Alphabet (Google) Class C: 291,860 shares worth $16.3M.
- Simplex Trading added most to Apple in Q2 2018, an estimated $34.5M increase.
- Simplex Trading's biggest Q2 2018 reduction was Amazon, cutting an estimated $31.2M.
- Simplex Trading fully exited Time Warner Inc in Q2 2018, selling an estimated $34.8M.
- Simplex Trading's ten largest holdings make up 29% of its $25.5B portfolio in Q2 2018.
- Simplex Trading opened 2,282 new positions and closed 1,035 in Q2 2018.
- Simplex Trading's portfolio value rose 1,022% quarter-over-quarter to $25.5B.
Based on Simplex Trading's 13F filing for Q2 2018, filed 30 Jul 2018.